Update README.md

Hanbing Leng · web-flow · commit fbe808e0161f · 2019-05-28T12:14:17.000-07:00
diff --git a/README.md b/README.md
@@ -27,4 +27,8 @@ TODO:
 !help <pname>
 !today
 !libraryhours
+
+e.g. !solved LintCode18
+     !solved LeetCode200 -m "This is a comment"
+     !show Richard -a
 ```
